Multi-Functional Microwave Photonic Radar System for Simultaneous Distance and Velocity Measurement and High-Resolution Microwave Imaging

Abstract

A photonic-assisted multi-functional radar system for simultaneous distance and velocity measurement and high-resolution microwave imaging is proposed and experimentally demonstrated by using a composite transmitted microwave signal of a single-chirped linearly frequency-modulated (LFM) signal and a single-tone microwave signal. In the system, the transmitted signal is generated via photonic frequency up-conversion based on a single integrated dual-polarization dual-parallel Mach-Zehnder modulator (DPol-DPMZM), whereas the echo signals scattered from the target are de-chirped to two low-frequency signals using a microwave photonic frequency mixer. By using the two low-frequency de-chirped signals, the real-time distance and radial velocity of the moving target can be measured accurately according to the round-trip time of the echo signal and its Doppler frequency shift. Compared with the previous reported distance and velocity measurement methods, where two LFM signals with opposite chirps are used, these parameters can be obtained using only a single-chirped LFM signal and a single-tone microwave signal. Meanwhile, high-resolution inverse synthetic aperture radar (ISAR) imaging can also be realized using ISAR imaging algorithms. An experiment is performed to verify the proposed multi-functional microwave photonic radar system. An up-chirped LFM signal from 8.5 to 12.5 GHz and an 8.0 GHz single-tone microwave signal are used as the transmitted signal. The results show that the absolute measurement errors of distance and radial velocity are less than 5.9 cm and 2.8 cm/s, respectively. ISAR imaging results are also demonstrated, which proves the high-resolution and realtime ISAR imaging ability of the proposed system.

Electromagnetic compatibility technologies based on multi-functional spoof surface plasmon polariton channels

“…According to (7), it is obvious that the coupling between two adjacent channels can be controlled by changing the phase constant difference (β 1 -β 2 ) and the coupling coefficient k 12 . Therefore, by changing the applied voltage for varactor diodes of different channels, the wavenumber difference between adjacent channels can be tuned, providing a solution for crosstalk suppression.…”

“…High integration, miniaturization, and reconfigurability are important development trends of modern communication and radar systems, which put forward higher requirements for the electromagnetic compatibility (EMC) and multi-functional performance of microwave circuits and systems [1][2][3][4][5][6][7][8][9]. One of the many solutions is to propose new kinds of transmission channels with both multi-functional ability and excellent EMC performance.…”

Design of Wideband FMCW Radar Transceiver System Using Photonic Elements

“…Moreover, various studies have been conducted including increase in detection range [ 7 , 8 ], use of high-frequency bands for low-RCS target detection [ 9 , 10 , 11 ]. In addition, there have been substantial efforts to implement various systems using microwave photonics technology for high-resolution images [ 12 , 13 , 14 , 15 ]. For example, in [ 14 ], a linearly chirped microwave generator using photonic elements was introduced for SAR systems with large-range resolution demand, such as Earth surveillance and monitoring.…”

“…However, most of the preceding studies have remained at the level of showing the feasibility of microwave photonics by employing indoor experiments [ 9 , 10 , 11 , 12 , 13 ]. Although several researchers have conducted experiments to verify the performance of the technology in a real environment, most of their studies have used targets with large RCS such as airplanes [ 8 ].…”

Verification of the System for Ship Position Keeping Equipped with a Set of Anchors in Unity3d

“…In addition to commercial MRS devices, solutions can be found in the scientific literature that use other dependencies related to microwaves. For example, the issue of increasing distance measurement accuracy using microwaves was discussed in [ 4 ]. The authors used linear frequency modulated (LFM) signals to obtain a position and radial velocity accuracy of 5.9 (cm) and 2.8 (cm/s), respectively, for moving objects.…”